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Korean nova records in A.D. 1073 and A.D. 1074: R Aquarii

Korean nova records in A.D. 1073 and A.D. 1074: R Aquarii. Hong-Jin Yang, M.G Park, S.H Cho, C.B Park A&A 435, 207-214 (2005). YTN TV 2005-01-28 09:30. http://news.naver.com/news/read.php?mode=LSD&office_id=052&article_id=0000065606&section_id=115&menu_id=115. R Aquarii.

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Korean nova records in A.D. 1073 and A.D. 1074: R Aquarii

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  1. Korean nova recordsin A.D. 1073 and A.D. 1074: R Aquarii Hong-Jin Yang, M.G Park, S.H Cho, C.B Park A&A 435, 207-214 (2005)

  2. YTN TV 2005-01-28 09:30 • http://news.naver.com/news/read.php?mode=LSD&office_id=052&article_id=0000065606&section_id=115&menu_id=115

  3. R Aquarii • R Aquarii is asymbiotic starbelieved to contain awhite dwarfand aMira-type variable in a binary system. The main Mira-type star is a red giant, and varies in brightness by a factor of several hundred and with a period of slightly more than a year; this variability has been discovered by Karl Ludwig Harding in 1810.

  4. Light Curve

  5. Previous Works • Kafatos Kafatos & Michalitsianos & Michalitsianos (Nature 1982) - suggested that the Japanese record of A.D. 930 is suggested that the Japanese record of A.D. 930 is associated with an outburst record of R Aqr associated with an outburst record of R Aqr [The Japanese record: 客星入羽林 始西行於羽林] - suggested highly eccentric, supercritical accretion suggested highly eccentric, supercritical accretion • Li Jiang Li Jiang (Ch. A&A 1985) - suggested that the Japanese record should be suggested that the Japanese record should be considered as referring to a comet, not a nova considered as referring to a comet, not a nova - suggested two Korean records of R Aqr: 1073 & 1133 suggested two Korean records of R Aqr: 1073 & 1133 (but, the record of 1133 is considered as a comet)

  6. Korean Historical Guest Star Records - the first guest star record appears in A.D. 85, and the second in A.D. 867 (Samguksagi) - cannot find any Crab SN record in 1054 : the political disorder in the early Goryeo Dynasty - two Guest Star records-outburst of R Aquarii : records of A.D. 1073 and 1074 - two SN records of Tycho’s (1572) & Kepler’s (1604) : recorded faithfully in Joseonwangjosillok

  7. Guest Stars in 1073 & 1074 : R Aqr - DongByeok (東壁: α AND and γ PEG) - R Aqr : RA 23h 43m.8, Dec. –15° 17΄ (J2000.0) - R Aqr is located in Urim (羽林), which is one of the minor oriental constellations, but, recorded in the south of DongByeok (東璧) - Urim consists of 45 stars and occupies the region of ~ RA 20h 30m ~ 23h 20m, Dec. –20° ~ 0°

  8. The location of DongByeok and R Aquarii

  9. Identifications 1) checked novae, SNe and cataclysmic variable stars within 40° × 40° in the south of DongByeok => have not found any candidate nova and SN 2) why the location is described as the south of DongByeok instead of within Urim => positions based on 28 oriental constellations 3) consider the brightness of the reference stars DongByeok (m=2.m24) > Urim (m=3.m54) => a brighter star would be used as a ref. star

  10. Implications for R Aqr (I) : Distance * Baade (1944) -- 260 pc : 600 yr ago 260 pc : 600 yr ago * Lépine pine et al (1978) -- 181 pc : Mira abs. mag. * Solf & Ulrich (1985) -- 180 pc : 600 yr ago * Whitelock (1987) -- 250 pc * Yang et al. (2005) -- ~273 pc : Korean records - from the epoch of outburst to be A.D. 1074, from the epoch of outburst to be A.D. 1074, 55km/s with an angular radius of 48" 55km/s with an angular radius of 48“ and, constant rate of expansion (Baade), and, constant rate of expansion (Baade), We estimate the kinematical distance = 273 pc

  11. Implications for R Aqr (II) : Brightness

  12. Implications for R Aqr (III) : Models • models for outburst of R Aqr : provide significant restrictions to models “ Two successive outbursts in one year ” “ The outburst of 1074 brighter than that of 1073” “ No outburst since then has been recorded”

  13. Summary & Discussion I. searched and compiled all Korean historical records of “Guest Star” and “Peculiar Star” II. found two guest star records in 1073 & 1074 that can be related with outburst of R Aqr III. identify the two records with outburst of R Aqr IV. implications for R Aqr - kinematical distance~273 pc - apparent mag. is 1~2 mag. => Moutburst = -6.2 ~ -5.2 mag. - propose models for outburst of R Aqr : provide significant restrictions to models

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